Allyl free radical electronic configuration

Figure 29.7. Allyl system. Configuration of tt electrons in cation, free radical, and anion.

There is a third kind of orbital called a non-bonding orbital. Electrons in these orbitals neither strengthen nor weaken the bonding between atoms. The 7r-electron configurations for the ground states, and first excited states of the allyl cation, free radical, and anion are ... 

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